Islamic Studies
Caliphate & Rulers: From the Rightly Guided Caliphs to the Ottoman Caliphate
Which Rightly Guided Caliph had the LONGEST reign?
Explanation
Uthman (RA) ruled for 12 years (23–35 AH), the longest among all four Rightly Guided Caliphs.
Reference: Islamic Studies - Caliphate & Rulers
, Page 1
Hint
Compare: Abu Bakr 2y 3m, Umar 10y 6m, Uthman 12y, Ali 5y.